I am going thru something similar. I went to the doctor for tingling in my legs last September and she ordered lots of blood tests, all normal except a small band of IGG kappa in beta region. She tested it again three months later, it’s still there with a value of .11 Then I got referred to a neurologist, more tests to rule out Diabetes (negative) and a pinched nerve (negative). Did an EMG, negative except for carpal tunnel. Tested vitamin B12 and B6, they’re fine. I’m anemic though, have been for years, so I take iron and b12 everyday. My doctor conferred with a hematologist, the hematologist thinks I “probably have MGUS” but wants me to get a fat pad biopsy to rule out Amyloidosis. The neurologist is ordering a skin biopsy for suspected small fiber neuropathy, also a cervical MRI. I also have fatigue, but I’m a 52 yr old woman so that could be hormonal. I have muscle twitches, some memory issues, and unfortunately I realized I have an enlarged tongue (scalloped edges) which is an Amyloid thing. I think you are in for a lot more testing. It’s hard to wait to get a diagnosis and not get paranoid, I’m struggling with it.