Weakness is lower body. If they work?

I am hypothyroid patient for last 7 years taking 150 mcg thyronorm tablet. Tested 1 moth before, TSH was 2.5 i.e. optimum level. Had Vitamin b12 and D3 deficiencies but got treated with supplements. Vitamin B12 level exceeded the upper limit which was 934 last month so stopped the supplements. Triglycerides level was 786 which has now reduced to 356 with herbal medicine. Total cholesterol is under normal range. From last year I had low bp issues. But I am managing it with moderate exercise and increased salt intake and fluid. From last 4 months I am feeling weakness in my legs and feet, mild cramps in thighs. Symptoms are less when I wake up from sleeps and starts slowly as the day progress. I consulted one neurologist in Pune. He suggested Nexito 5 mg twice a day and Benfo Tab twice a day for 15 days. Do these drugs have any potential side effects or addiction building properties? Shall I take medicines for 15 days and check if they work? Some guidance will be appropriated.