I am a 21 year old female with generally good health. Three days ago, I began getting these twitches and tremors in my mid/lower back on my left side. They aren't really painful, just more of an annoyance and discomforting. It feels as if an organ or a deep muscle is twitching pretty violently and irregularly, and in the same spot - the number and frequency vary with the position in which I am sitting and laying down. It has been nearly constant for the last three days after suddenly appearing. They are rare when I am up and moving.
I'm concerned it might be something serious, maybe something is wrong with my circulation - a blod clot possibly, as I am on birth control pills anf I know this is a possible side effect, or maybe it is an organ, perhaps a kidney, that is pulsating. I feel okay overall despite this, except for a little nausea caused by the twitchng being sort of close to my digestive system and a little very slight back pain. I haven't recently strained it (I don't do a whole lot of physical activity) and I have never had this happen before. The only thing that could be a cause is that I drank the night before about four drinks, which I do about once a week at the very most. I understand it might be some type of nerve problem and I don't know how relevant this is, but my father has MS.
Please let me know if I need to go see a physician or if it something that will most likely pass.