First I want to welcome you to the forums where you will find a plethora of information on our health pages:
http://www.medhelp.org/health_pages/Multiple-Sclerosis/list?cid=36&container_name=Multiple-Sclerosis
Here you will find a lot of answers to common questions as well as confirmation of what you feel that you may be going through.
Although there are many diseases that can mimic MS (as you very well know by now) and I'm sorry to say, many are in your position where they are waiting to find out what is going on. Unfortunately, sometimes things are not always black and white. Sometimes "time" is needed to reveal the culprit. Some people were diagnosed quickly with MS, some waited years, decades and even more so. I'm not saying that will be you, but when you have neurological symptoms, T2 hyperintensity lesions (depending on where they are), along with negative evoke potentials, or negative OCT (neuro-opth) examination to see if the optic disc is thinning, and negative lumbar puncture (don't get discouraged if yours is -- 10% of people with MS have negative lumbar punctures) -- please don't expect answers immediately or a diagnosis immediately.
Most times people like us will "wait" and will get "sick and tired" of no answers or doctors vacillating between diagnoses.
Hang in there kiddo, its a rough road and I can empathize with you.
No one can tell you if your feet will return to the normal motor and/or sensory to 100%. I don't even think doctors who sit 5 feet away from you can tell you that. I wish I could tell you that, but I'd be a fool to do so.
Being scared is normal as you know and what is great about these forums is that you can vent all you like about what you're scared about, what tests you're going through, the results negative or positive and just plain old support from those who have "been there and done that".
Keep us informed how your lumbar puncture goes.
I wish you well and good luck
Lisa