annie,
swallowing difficulties has been one of my longest sx's. When swallowing items such as bread, meat (steak), etc. i frequently feel like my esophagus is spasming causing tremendous pain in my upper chest and after a few seconds it eventually releases and the food goes down and the pain goes away. i can breathe when it happens, i just have to stop and let it relax and pass. sometimes i literally CAN NOT swallow and that scares me

, but if i get something to drink, my esophagus will work like its supposed to.
another time my esophagus spasms on me is in the middle of the night when i get up thirsty and go to the fridge and get a cold diet soda and begin drinking, my durn throat will constrict and the pressure of the carbonation will actually force it back up. I do not have acid reflux, but do get occasional chest pain like heartburn. also, i get this weird thing after drinking something bubbly, i have to burp, but it comes out crossed between a burp and a hiccup. very weird and funny sounding
i know exactly how you feel about having so many unexplained sx's. i am 40 and have had problems since about 1991-1993 (but really had problems from about age 7). just keep a journal of sx's, be patient, get to your neuro and have a brief list of sx's & keep your appts, plus write down questions you might have. try to relax and realize MS is hard to dx and sometimes it takes years before a dx can be made and the doctors must rule other things out first.
i am undx'd but my neuro is 95% sure its MS. we are in the waiting game. i go back in Nov for another MRI on my brain. All my MRIs have been clear and my LP was clear, but doc said that does not mean that i DON'T have MS. i have fibromyalgia, raynauds, sjogren's, interstitial cystitis, hypothyroidism, etc etc.
welcome to the board and know that you are not alone and many people here can relate to you. stay around, ask questions, and search this board to try and find someone who might have experienced your same problems.
blessings,
michelle