Hi Taylor!
I bet the heat of the summer doesn't help your neurological symptoms one bit, either! I am wondering something. Have you had a thyroid test with your bloodwork? Your heart rate, bloodwork, neurological symptoms, shakiness, fatigue, lack of sleep, eye issues, etc. seem to go along with a thyroid disorder or metabolic symptom. Your symptoms seem to support hyperthyroidism. I have the oppositie--hypothyroidism. I have problems with my blood pressure, irregular heart beat, fatigue, cognitive issues. Hashimoto's is an autoimmune disorder. It typically starts out as hyperthyroidism before turning into hypothyroidsm. As it turns out, many people with MS, from what I've learned in this forum, have thyroid disease. I probably had hyperthyroidism when I was younger because I was very thin and just couldn't gain weight. Well, enough of the thyroid stuff. Your tests probably normal and I'm just rambling on and on about it.
The echocardiogram will rule out a few things, too. They found something on it, and I can't remember what it was--but it was minor and was not going to be an issue. My sister had the tilt table test, and someone is with you the whole time. She does have some autonomic dysfunction that the neuro said to her that probably goes along with her MS. I would explain your fear to the cardiologist before you start the test. Maybe he will stick around in the room to help relieve the anxiety about the test. Maybe have someone go with you, too.
To answer your question about the MRI. My first MRI was negative. When I had the first one, my GP order it and was not looking specifically for MS. He ordered it to rule out a brain tumor. I was having many headaches and had an array of symptoms. The MRI I had was done on a weak open MRI machine. Lots of things can be missed when MS protocol isn't used. My second MRI on a 1.5T machine with MS protocol two years later, revealed lesions--at that time the neuro said that I had a demyelinating disease because of lesions around the corpus callosum. Six months later, even more lesions and the growth of the lesions that I had. I was diagnosed the day that the neuro went over that MRI.
My sister had a very difficult time getting her diagnosis. Her first MRI was read as normal. She went to several neurologists. Finally, she gets another MRI of the brain and C-spine. Her lesions were found in her brain stem. She is quite a bit more disabled than me and cannot walk. It's amazing that the neurologists didn't find anything, but from what I understand is that sometimes brain stem lesions are hard to spot. Now she has lesions spotted on the other parts of her brain and even black holes and is on a Tysabri infusion that she receives once a month.
I'm sorry if I'm rambling, but wanted to kind of answer your question about the MRI. Yes, it is possible to miss MRI lesions. Sometimes, especially early on, they are just not ready to show on the MRI. Additionally, sometimes the radiologist misses them. My radiologist report differed from what my neurologist saw when he went over the MRI in his office the day of my diagnosis. The neurologist should go over the MRI with you looking over his shoulder.
There are lots of great health pages on this site written mostly by a doctor (formerly a pediatrician) that frequently posts on this forum and was one of the founds of the forum named Quix. She is very knowledgeable and has quite a story herself. I'm going to attach a link to one of the pages that she has written. There are other really good ones. If you go up to the upper right-hand corner of this page, you'll see other good ones.
http://www.medhelp.org/health_pages/Multiple-Sclerosis/How-Can-a-Person-with-MS-Have-a-Negative-MRI/show/161?cid=36
I would get a copy of all of your bloodwork, MRI report and the actual MRI on CD/DVD. Start keeping records for yourself. I'm not saying you have MS, but the kinds of symptoms you're having need an explanation.
Wishing you the best, my friend. Hoping you're feeling better today.
Deb