Hi, ! I am glad you reached out here. I know the symptoms you are experiencing must be pretty annoying and disconcerting to deal with. While numbness can be a symptom of MS, a doctor will want to rule out a number of other conditions before making a diagnosis of MS. You can read about those conditions here -- https://multiplesclerosis.net/diagnosis/ruling-out-other-health-conditions. Also, MS is diagnosed with a variety of tests, so bloodwork alone wouldn't catch MS. Here's some information on those tests -- https://multiplesclerosis.net/diagnosis/tools-your-doctor-will-use-to-make-a-diagnosis. A doctor may not utilize all of the tests discussed in the article, but he/she will definitely use more than just bloodwork. You can talk to your doctor about pursuing more testing.
I don't want to hazard a guess as to what you are experiencing, as I don't know your medical history and it wouldn't be wise to offer medical diagnosis or opinion based on your post. But, I do hope you pursue getting answers! You deserve to know what's going on. Numbness can be caused by any number of things, from the innocuous (sleeping in a weird position) to something more serious (blood pressure issues, MS, etc). And your doctor should be willing to help you find out the cause of your issues.
Best, Erin, MultipleSclerosis.net Team Member.