@Andrew11101,
You're quite welcome. Wishing the best for you.
Medications may or may not be the cause of the weakness. However, there are other things like proper sleep, good nutrition and taking vitamins and/or nutritional supplements that you can take to strengthen your body while the meds do their thing.
Speak to your doctor further and ask what can be done to either change the meds, or alter the dosage, or suggestions for you to make this period of time more bearable.