Welcome to our forum JemmaP1.
First thing of course is to say I am sorry you are undergoing cancer treatment at present so you definitely didn't need to be hypothyroid too.
First, your TSH is too high and it is trying to flag your thyroid gland to produce the necessary hormones. A normal range is up to around 5, so your pituitary gland (where TSH comes from) is working overtime.
You will be given levothyroxine a synthetic thyroid hormone and it is usually 50mcg to start with and a blood test every six weeks and an increase of 25mcg until your TSH is 1 or lower and you should feel much better.
When you have a blood test for your thyroid hormones it has to be the earliest possible, fasting (you can drink water) and allow a gap of 24 hours between your last dose of levo and the test and take afterwards. This keeps your TSH at its highest as doctors are apt to reduce it if TSH looks too low.
Levothyroxine should be tken first thing on an empty stomach with one full glass of water and wait about an hour befor eating. Food can interfere with the uptake. The doctor should also do a B12, Vit D, iron, ferritin and folate to make sure these aren't deficient.
Your photo is cute and you do look a lovely. With best wishes for your continuing treatment for cancer