Anyone know about going back in the army after medically discharged?

Depending on your MOS and if it is critical to the Army's mission, a waiver might be possible. But there may be a hitch. You might have to sign a waiver saying that you will not continue the medical discharge against the Army.
Speak with a JAG lawyer if there are any doubts.

SPC (Join to see) My personal experience. It took me 18.5 yrs to get back into the Air Force (via the MO Guard) after my medical discharge in 2000. I went through 3 recruiters before I found one that was bulldog enough to not run from the fight.
You'll want every shred of documentation you have showing the condition that led to the discharge is no longer an issue. Letters of Recommendation are a huge bonus. I got one from the Chief of Neurology at my local VA, and a former JAG of the USAF, with whom I serve on a scholarship committee.
It's a long fight. You will need to get a waiver just to get to go to MEPS. MEPS will then need to clear you. You will then need a waiver from the Surgeon General. Your recruiter should know the dominoes that need to fall, and how to set them up to fall at the right time.

Talk to a recruiter. Your best bet, in my opinion, would be to demonstrate that the medical disqualification no longer exists.