Drank Coffee Heavily For Over A Month. Was Feeling Dizzy

Drank coffee heavily for over a month. Was feeling dizzy & spaced out when driving so i quit. My health has gone down.- Brain fog, light-headedness. tunnel vision. I feel like i am dehydrated all the time. After i drink tons of water i feel normal for a while..... After i work out i feel flushed. My anxiety is escalating. Brain fog comes and goes. I took an 800 mg ibuprofen one day and got so spaced out i freaked. .. I have good days and bad. Today went for a walk. Wasnt feeling good. drank 2 bottles of water. felt better. drank more water and felt normal.. then got home.. got super spaced out and felt terrible. I feel completely drained.. yet my body is rushing with energy.. Sorry for my grammar. I am going to buy a glucose test.