Hi MarkMin, This is a tough one so I'm gonna talk in three broad areas; 1)Psychology 2)what's going on inside your mouth 3)endurance Psychology: I've seen many students hit a brick wall with a particular passage or high note and it would give them fits for quite a while. Air wasn't leaking before, right? Well, you have to ask yourself "why is air leaking out when it didn't before? Why is it continuing to do this and (here it comes) are you predisposing yourself when a high note comes along. Do you say to yourself "Oh damned, I'm sure hoping I can play that note without air leaking out". Don't underestimate the ability of our mind to get in the way of us getting something done. Try this: Take the pinky out of the ring and (if you can) put it touching the furthest outer part of the ring(that part which is closest to the bell). Try this for a day and see if it works. It'll be hard but if its your brain getting in the way, this should help fix it. --- Inside the mouth: The tongue should go higher in the mouth from aaaaaa to eeeeee. My experience is that high notes are not hard. Its more like walking a tight rope or a balancing act. Making sure I'm not blowing too hard or using too much tension and still remain musical. Check out a site called Arch Tongue and Hiss. Its helped a lot of people. ---- Endurance: You said you're coming back from an extended illness, right? Well it could be that your body is saying "I'm not quite ready for that note yet" A person who's a moderator on this site called rowuk will often say "things take a long time to build and consistant repetition is the key" I'm paraphrasing here but he's spot on. Work to get what you want but understand its gonna take a while. ABtrumpet brought up something about mouthpiece size. If you can do this without spending money, try this: Go to your local music store (with your trumpet) and try a Bach 10 1/2 C and see what you think. You might be surprised! Good Luck!