It sounds like a milder air hunger. There seem to be lots of variations on it.
DS just had an episode this morning while running and was able to get it under control with 3 puffs of albuterol. He has had to take ativan 1 time when it turned to hyperventilation and hypocalcemia. That was after exercise in extreme heat which we now know he can't do!
In general all the time he feels he gets 50% of the air and when it plummets to feeling like 10% he starts hyperventilating. Thus he uses an inhaler a few times a day which helps get it up to 60-70%. His breathing often doesn't sound normal too like you describe.
We encourage him to practice deep breathing when he's not in hyperventilation mode and he discovered that tai chi also helped loosen the chest tightness. You could try that.
Some people experience terrible bouts of it in the middle of the night. Luckily that hasn't happened to DS.
His co-infections are babesia and mycoplamsa which both affect lungs. It seems to me that it is chest tightness combined with actual lung/blood oxygen transfer issues.
Parent of 14yo DS with +Lyme test in Nov 2015, co-infections: mycoplasma (strongly +), babesia, mainly with antibiotics/anti-malerials. Supplementing with Vit D, Vit C, Vit B-12, multvitamin, milk thistle, dandelion, nettles, Burbur/Pinella, L acetyl carnitine. Magnesium oil, charcoal led to shorter herxes.
Website I started: ParentsofLymeKids.com