Hello Milly2015, the over active thyroid is more complicated to fix. When I was at college there was a member of staff who had the over active condition, she was galloping around, and generally going fast at all things, well the out come was she went into hospital and had her thyroid out , and then condition was monitored and the necessary medication were given.
She was glad that it had been sorted out, as she was tired with all the rushing about that the condition made her do.
I do not know if she was on medication permanently or if her body would regulated it self.
If the hospital endocrinology department is not getting to the bottom of the problem then they need to read up on the treatment options, including surgery, be brave and suggest the operation option to them, they may be trying to do the job with medication, but there needs to be a cut off as the out of balance can cause other medical problems to bones and such.
Milly maybe a bit of medical research is needed , I think there is a web site to help, and google may help, also I have had some helpful information from the Boots the chemist own site. Find them and sign up for the WebMD option and then go through to the thyroid section, these can be sent to you weekly on many different subjects, I save them to a file for future use.
Milly I hope they get their act together and get you sorted out very soon till next time, ttfn Karen