Please get your iron and thyroid levels checked by your gynac first. Weakness is common, but it's always safest to let your doctor guide you on supplements.
I had a lot of weakness during my pregnancy which continued post my C-section too. Eating small, frequent meals and keeping myself hydrated with coconut water really helped me regain strength slowly.
I completely understand how exhausting it feels, your body is literally growing a whole human! Please don't feel guilty about resting, just sleep whenever you can and take care of yourself.
I had severe blood pressure fluctuations which caused extreme weakness and dizziness. Please don't ignore it or try home remedies alone, check with your doctor to make sure everything is fine.
Keep your mind calm and trust the process, your body is doing a beautiful job. Take simple ghar ka khana, pray, and don't take any stress, everything will be fine.
My weakness was due to low hemoglobin, which also affected my energy later during breastfeeding. Try to have dates, dry fruits, and lots of milk, it really helps build stamina.
