Total exhaustion!

Hi, I am 39 yrs old female.I have been constantly exhausted for the last 12 months after having a bladder infection. I then got a kidney infection within a week, even after taking the course of tablets.After a fortnight I was woke up in agony and could not speak for about an hour. I went to the dr and was told it was probably a kidney stone.Although no test and I was in agony for about 3 week.I was okay for a week then was hit by complete exhaustion and sweating.Just walking upstairs tired me out.I was like this for 8 weeks with no energy apart from the basic making tea for the kids but had to get taxi with smallest of shopping when before I walked with it.I lost 2 stone in 6 weeks last summer, but since then I put 3 stone on, I hardly eat,I have been ok for a week or two then exhausted with recurring flu that I almost get rid of but it never goes away completely and comes back again.Out shopping one day my eyesight went completely itwas like somebody tightening a belt round my head vertically round the back of my ears to the top of my face, this stopped when I was sick and it felts like my eyes would pop out.When I woke up the next day I had bloodshot eyes.I feel sick and have had dihoreah I feel almost drunk especially when standing for longer than half an hour.I have a sharp ringing in my ears which really hurt, I have sore glands in my neck and my nose is streaming and my eyes feel like theyre on fire.I need to rest during day after just washing up or making a meal as I feel like I have ran up a mountain, at night I wake up aching all over.I do not have any energy I cannot always get what people are talking about as it goes muffled, this is annoying them and myself much.I cannot really tollerate any people other than my own children and a few of my close relatives.I cannot be bothered even looking at anybody else. I was never class clown but I never used to be like this. I forget to take really important documents with me, and stupid things like the hairbrush etc. I dare not go to the drs incase he says im crazy or making it up.I am so sick of being so exhausted.Strangely I have loads of energy for one odd day for no apparent reason which I make the most of and go round visiting, and catching up on errands, then back to being exhausted when I come back.I cannot stand it anymore. Help anybody?