Hi. I wonder if you can help? I had half my thyroid removed in April because of a 2.2 cm tumour, which was eventually found to be a medullary cancer. Luckily it hadnt spread to my lymph nodes and calcitonin levels were found to be practically zero. I'm still waiting to discover whether or not I have the gene.

Blood tests have found that my half thyroid is functioning as hoped. However I am constantly hot and sweaty (whereas I have never been like this in my whole life), I feel exhausted or fatigued a lot of the time,  my joints ache, I have had 2 occasions where my head felt like it was going to explode and a severe dull ache travelled down both arms (both times were linked to emotionally charged situations), by the end of the day my neck feels swollen and choky and I have put on weight which I cannot shift despite exercising and eating a healthy diet. This is bothering me as I know I would feel more positive if, at the very least, I could control this weight issue. 

On certain days I feel so fed up and tearful about everything. Then other days I feel grateful that the tumour was removed.

Please do you have any information and advice on what I should or should not be doing to get myself back onto some sort of an even keel?

Many thanks for your anticipated help.