Googling snake meanings will bring forth lots of info, but this is one I found. The fact that your snake was yellow would correspond to the solar plexus chakra, so I would look at the aspects below in relation to issues around that area
From Animal-Speak, the Spiritual and Magical Powers of Creatures Great and Small by Ted Andrews ISBN 0-87542-028-1
Keynote: Rebirth, Resurrection, Initiation and Wisdom
To the Native Americans, the snake is a symbol of transformation and healing. Snake ceremonies involved learning to transmute the poisons within the body after being bitten multiple times. These activated the energy of kill or cure, ultimately leading to dramatic healings.
In the Meso-American societies, the serpent or snake was depicted as feathered and flying, a symbol of their greatest god and hero, Quetsalcoatl, the embodiment of the dying god who would someday return. In many ways he was the patron of the Toltecs, and it was said that the heavens and stars and all the motions of the universe were under his dominion.
In Greece the snake was also a symbol of alchemy and healing. The god Hermes carried a staff upon which were entwined two snakes. This caduceus symbol is the primary symbol of western medicine and doctors. It is the symbol of wisdom expressed through healing.
In India the Goddess Vinata was the mother of snakes and a symbol of water and the underworld. Also in India were the demigods, Naga and their beautiful wives Naginis, who were usually depicted as half cobra and half deity. The god Vishnu is often depicted sleeping on the serpent of eternity call Ananta. Shiva wears snakes for bracelets and necklaces, representing sexuality.
The serpent has long been a symbol of sexual/creative life force within humans as is taught in eastern traditions. The kundalini or serpent fire lies coiled at the base of the spine. As we grow and develop, the primal energy is released, rising up the spine. This in turn activates energy centers in the body and mind, opening new dimensions and levels of awareness, health and creativity.
In Chinese astrology, one of the twelve years is named for the snake. Those born within that year are believed to have the qualities of compassion, clairvoyance and charm. They usually need to learn lessons associated with forgiveness, superstitiousness and possessiveness as well.
In Egypt the snake has also has mystical significance. The uraeus is a head band in the shape of the snake. The head of the snake rests and sticks out at the brow area. It was believed to represent a state of inner sight and control of the universe. It was a symbol worn by those who were initiated. Some believe it to be variations of the eye of Horus, while others see it as the sacred eye of Ra. It represents a certain degree of wisdom and understanding.
Because it sheds its skin, the snake has long been a symbol of death and rebirth. Before the snake begins to shed its skin, its eyes will begin to cloud over. It gives the snake a trancelike appearance. To many mystics and shamans this indicated the ability of the snake to move between the realms of the living and the dead, of crossing over from life to death and then back to life again.
The snake has often been depicted along with its relatives, the serpent and the dragon as a guardian. It is found in myth and lore guarding treasures, the springs of life or sacred places.
Anytime a snake shows up as a totem, you can expect death and rebirth to occur in some area of your life. It can also reflect that your own creative forces are awakening. Physiologically, it can activate the sexual drive, bring more energy, etc. Spiritually it can stimulate greater perception of how to apply your insight and intuition. Your own vision and intuition will become more accurate. Learning opportunities, formal and informal will surface frequently. You will be able to swallow and digest whatever you take in.
Learning to use the eyes to mesmerize and look into the hearts and souls of others directly is part of what traditional snake medicine can teach. It may even indicate a need to look more closely into your own heart and soul.
Individuals with the snake totem will find themselves extremely sensitive to smells and fragrances.... the sense of smell is linked to higher forms of discrimination and spiritual idealism.
Snakes are symbols of change and healing. They have speed and agility, so those who have snakes come into their life will usually find changes and shifts occur quickly and are soon recognized and defined. When snake comes into your life you can look for a rebirth into new powers of creativity and wisdom.