Talk to General Physician on Weakness, Lack Of Energy

i had a baby 4 months ago, i was fine initially, wasn't as weak or tired, started doing housekeeping from day 3 but gradually my health started declining, now I am struggling with doing even the basic chores. I am breastfeeding. i am feeling very weak, sleepy all the time, nauseous, brain fog, very clumsy, can't focus on any thing. i am short of breath all the time. blood pressure is usually around 110/70 and pulse rate is almost always 96 or 98. hands and feet are feeling very weak even slippers have started to feel heavy when I walk. upper arm muscles are aching and legs feel like they can't lift my weight. even when i speak,i speak very slowly and with difficulty. i have chest pain and upper most left rib aches. i had a severe migraine attack 2weeks back and after that i get a sharp pain a few times a day on one spot left side of the head and every time the pain is at the same spot. my eyes also hurt, my eye sight is alreay very weak, like -5.5 and -4.5. i got checked for the eyes