if after all your exams everything comes out to be normal, then anxiety could be the cause. I had the same symptoms and all tests were normal. But you do need to get checked out first.
Hello.
There can be many possibilities. You will have to rule them out one by one.
If your blood sugar is normal, and you never had Diabetes, you can rule out Diabetic neuropathy.
You may also have low blood pressure, anemia, vitamin deficiency, nerve compression, etc. If you have any other symptoms you can mention them here.
You should visit a Neurologist, if you have not already done so.
Regards