You can always request the antibody test for MG, but if you are in the early stages of it, the test may come back negative. If it comes back positive, you have a definitive Dx; if not, you're going to have to keep paying attention to your symptoms.

Does either one of your eyelids droop? For a lot of people, that's the first indication that there is something wrong. You'll want to compare pictures of your eyes in the morning and later in the evening. Given your age, it may be quite subtle.

The neuropathy is troubling in someone your age - it definitely is not normal to have that.

Trust your instincts; if you KNOW that something is wrong (and you're sure it's not anxiety), then keep looking until you find some answers. Doctors only see you for a short "snapshot" of time - they don't know what you are feeling 24/7.