Yeah, try to find a solid way to keep your momentum and then it's pretty easy. Find another level with a similar small wall and practise there, if that helps you.
Oh, and prepare to hate a lot another gameboy warp zone on Hell, i think the one on level 14.
This is exactly what I was thinking, OP, you are going to hate The Key Master warp zone in Hell, the second level has a similar concept but with a much larger gap between the bandage and the wall, you can only just barely make it back to the wall to climb back up, but you can cross that bridge when you get to it.
To be on topic, the one nice thing about the Tunnel Vision bandages is that you have a lot of extra space beyond the side of the screen to jump so you don't need to be quite as precise as you would in many levels (going off of the screen will not instantly kill you). I'm not sure exactly how much extra room you have but as I recall it was very noticeable so take advantage of it and jump off the wall towards the bandage with more speed if that makes it easier for you.