Is There A Possible Way To Regain Concentration, Unsociability And Deterred Motivation Without Having To Consume Ritalin?

Hello, My name is Henry, I'm having lots of trouble with my mind worrying all the time, making bad decisions, can't keep a job, my marriage is been off because of my problems, can't concentrate, not attentive, not sociable and have no feelings in getting motivated to do tasks. I've been going to doctors for over 20 yrs and not one of them have done tests. They just guess and say here try this medication, if it soesn't work well try another and another and so on. Been taking Ritalin for 3 yrs, 20mg twice a day. I tell my doctors that if I take 20 mgs 6 of them seperately doing the day I feel absolutely fantastic, I'm sociable, more confident, attentive, and make better decisions. but 2 20 mgs a day just don't do it. AT ALL! I take 3 in morning everything is great until 2.5 hours later. THey wear off and I'm back to being aweful, So I take 1 for another hour then 1 for another hour and 1 for another hour. That seems to work really good. But that is like overtaking my meds that were prescribed to me. Why can't they just prescribe me 3 40 mgs a day? I want to be better after all these yrs of taking off the wall medicine that don't work. but don't want to over tale whats prescribed to me. Adderal is aweful, and so is dexedrine. Ritalin LA and RA makes me wired and jittery don't work at all. Can someone please after all these yrs help me? In my opinion I need tests run brain and blood work, but haven't in 20 yrs had any. I asked them too, but they say no u don't need tests.