Climbed Like a Rocket now on a HUGE loss streak! Pls help!!

Hey guys, so here's what's going on. I'm an average low gold player skill wise, that's about where I ended up the last season I actually played (S7). This season I started up again and got placed B4, pretty shitty but it was whatever. I climbed super fast skipping B3 and B2 straight to B1, then hoping into silver where I again rose fast all the way to S1. About as soon as I hit S1 I hit a wall and I mean like full sprinted into a steel bulkhead that was moving twords me kinda wall. I'll win like A game and then lose 10, repeat. Now back to S4.... Am I just going crazy or was I diagnosed with some form of autism and now phisically can't win any more. PS: I had a 70+%WR with my main, now at like 60% and I still "carry" alot of games but still lose.