Need Help, diagnosis?

Hello, I am a 21 year old male. Currently, I have been having a wide range of symptoms and it has me really worried. To begin with, I have been grinding my teeth since the age of 9 or 10. I only grind my teeth voluntarily and do not do it at night. Furthermore, I twist my torso/lower back, similar to how I grind my teeth. My lower back and neck is always stiff/rigid. Both of these motions are voluntary and doing them leads to relief. Also, I have experienced muscle twitching since 10 years of age but only once a month or so. Now my muscles twitch regularly every day especially in the thighs and legs. I also am having some difficulty swallowing where in the day my throat is clear but it gets progressively worse throughout the day, where it feels like I have something stuck in my throat. Recently, I have also begun to experience jerky movements at night right before I am about to fall asleep, and these movements wake me up.For example, my arm will involuntarily jerk, waking me up. At the same time I have been experiencing depression/anxiety. I have been to the doctors and done blood tests where everything came back normal. The doctor has referred me to a neurologist to determine what the cause. I am just confused and want to know what I have. I think it is a neurological condition of some sort, and I am 100% it is not anxiety/stress. I believe I may have early-onset Parkinsons, Multiple Sclerosis, Huntington's or some other nervous system disease. It is the lack of certainty that has me worried. I just want a clear diagnosis so I can put my mind to ease. Sorry for the long post, but I really needed to get that off my chest. Please help if you can :(