Yawning and shaking is normal. Teary eyes also, in case you get that too.
It's hard to give meaning to a bunch of visions without understanding your life's circumstances. In the end only you can really put everything into perspective. Especially since with a lot of trips the main information lies in the emotional tones of what is happening, and that is something - as you will surely agree - that is very hard to communicate to others.
That being said you have some very interesting symbolism in your visions. Now symbols can be a way for our subconscious to speak with us, as in dreams. But what these symbols are associated with in our minds can be different from person to person, depending on culture and personality / personal experiences. So I can give you some general brain-storming like ideas that you can ponder upon and then discard once you realize they are irrelevant, or perhaps they can help you develope a way to decipher your visions for yourself. Who knows.
So you have:
The snake. The snake in christian culture represents forbidden knowledge, seduccion, lies, duality. In other cultures, such as south-american native indian, the snake can be a symbol of a portal between two worlds or even a symbol of fertility. In India there is the kundalini snake, coiled and waiting to be awakened, represnding desire and transformative energy. The kundalini energy or snake is supposed to move upward through the spine at awakening. Some famous symbols with snakes include the oroboros - a symbol of eternal cycles - and caduceus (the staff with the two serpents) - a symbol of the God Hermes, the messenger of the gods, guide of the dead and protector of merchants, shepherds, gamblers, liars, and thieves.
You, being pulled upside down. This reminds me of the Tarot card "the hanged man", which in turn reminds me of the story of Odin who hanged himself from a tree to learn the art of the runes. It's a transformative symbol from this perspective and a symbol of sacrifice - yourself onto yourself. Upside down means all your belongings fall from your pockets and you bring nothing with you.
The featus. Featus obviously symbolizes the beginning of life, or the beginning of something. Like a seedling. Something that will grow. There are people that believe that we all have some kind of a birth-trauma, that affects our lives negatively. Darkness and warmth are probably what you would experience being an unborn. The moment of birth must be a devastating event, having to leave that comfortable place and enter a world of bright lights and cold and hunger and needs.
Feeling of sickness. Something is not right or may not turn out the way you want it. Or if it's memories, something didn't go the way you wanted it. This is something very personal and impossible for me to give you anything to go on. You have to figure out what this sickness is, where does this feeling stem from, what does it lead to. Probe, be honest with yourself, be fearless in your search, be loving with whatever you find. Repressed emotions might appear as horrifying and repulsive and alien, but if we don't integrate them and bring them back into the light so to speak, they will weaken us and create resistances in our life and pursuit of happiness.
slap in the face: a wake up call?
These are just some possibilities of interpreting the symbols in a somewhat separate manner. And reading symbols is just one way of many how to deal with experiences. So whatever you make of it, don't let it be your only approach to figuring this out. The more ways you look at your experience, the more you can learn from it. Perhaps there's no, "oh-this-is-what-it-meant" kind of moment, but that doesn't mean that you can't benefit from practicing self-reflection using the visions as a basis.
Good luck.
Buon viso a cattivo gioco!
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The Open Hyperspace Traveler Handbook - A handbook for the safe and responsible use of entheogens. ---
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