Welcome to our forum,
I am sorry you have hypothyroidism but the 50mcg of levo is only replacement hormones and it is the hormones that run our whole metabolism, so there's no need to be scared of taking it.
Many women take hormones, particularly if their body isn't providing sufficient.
The hormones run everything in our body from head to toe and brain and heart need the most.
High cholesterol is a clinical symptom of hypothyroidism and you have probably been hypo for a long time and doctors nowadays do not know any clinical symptoms.
Thyroid hormones reduce our cholesterol levels more naturally than statins but don't stop taking them suddenly.
If you tick off your symptoms, I bet you have more than a few and probably been hypo for a long time.
We have to read, learn and get ourselves better and doctors seem to be the worst offenders in that they only look at a blood test and don't enquiry about any clinical symptoms but will provide 'another' medication for the symptom rather than optimally treat their patient for their condition.
Don't stop any medication suddenly.
Hypothyroidism is a very serious condition if untreated, in that if we pay for our prescriptions usually, if hypo we are exempt for any other prescriptions for any other illnesses we may get/have.
First, all blood tests have to be at the very earliest, fasting (you can drink water) and allow a gap of 24 hours between your last dose and the test and take it afterwards. This gives us the best result, i.e. TSH will be higher as that's all the professionals appear to take notice of. Levo should be taken first thing with one full glass of water and wait about an hour before eating. Food can interfere with the uptake of thyroid hormones.
GP should test B12, Vit D, iron, ferritin and folate as everything has to be optimum.
Post your results with the ranges (always get a print-out of your results). Tick off the symptoms you have.