Sure . My Dad Was Taken To The Hospital Several

Sure . My dad was taken to the hospital several weeks ago with a possible tia. He has had a mri , mra, heart tests ultra sound on arties. Everything came back ok... He says his legs get weak and he goes down and lightheadness and neausea. He has had a tia 4 years ago and shingles and be dealing with vertigo. But his tryroid leavels were high and were checked 2 weeks later dropped half. But not checking to see if he has had any other thyroid problems. He also has issues with his B12.

Thank you if you have any advise. Vicky (concerned daughter)