I really don't understand why doctors trot out this rubbish. If she doesn't think you need Levothyroxine and that taking it unnecessarily is so dangerous why does she prescribe it? If she's prescribing it because she thinks you do need it why try to scare you?
I would love to see any evidence that your GP has to show that taking Levothyroxine causes blood clots! Overmedicating can cause atrial fibrillation and osteoporosis but no one is suggesting she should over medicate you and 50mcg is very unlikely to do so.
The true benefit of continuing with Levothyroxine is the relief of your hypothyroid symptoms. TSH dropping from 4.4 will indicate whether 50mcg is adequate or not. I can't agree with your GP that testing FT3 and FT4 is a waste of time and as my endo orders them I don't suppose she does either.
The goal of Levothyroxine is to restore the patient to euthyroid status. For most patients that will be when TSH is 1.0 or lower with FT4 in the upper range. FT4 needs to be in the upper range in order that sufficient T3 is converted. Read Treatment Options in thyroiduk.org.uk/tuk/about_... Email firstname.lastname@example.org if you would like a copy of the Pulse article to show your GP.
Thyroid peroxidase antibodies are positive for autoimmune thyroid disease (Hashimoto's). There is no cure for Hashimoto's which causes 90% of hypothyroidism. Treatment is for the low thyroid levels it causes. Many people have found that 100% gluten-free diet is helpful in reducing Hashi flares, symptoms and eventually antibodies.
For maximum absorption Levothyroxine should be taken with water 1 hour before, or 2 hours after, food and drink, 2 hours away from other medication and supplements, and 4 hours away from calcium, iron, vitamin D supplements, magnesium and oestrogen.
It takes 7-10 days for Levothyroxine to be absorbed before it starts working and it will take up to six weeks to feel the full impact of the dose. Symptoms may lag behind good biochemistry by several months.
You should have a follow up thyroid test 6-8 weeks after starting Levothyroxine. Arrange an early morning and fasting (water only) blood draw when TSH is highest, and take Levothyroxine after your blood draw.