Hi there is a family history of underactove thyroid and autoimmune disease in my family. I have a lot of symptoms that match but my thyroid test was normal but my blood viscosity is not, am no being tested for arthritis or lupus but do either of these affect tiredness, memory, urination, digestion or your sex drive please? I am 33years old, 5ft 6inches and have recently increased my weight dramatically to 14 stone for no reason.