I have central apnea and a daughter with Jejunal Atresia. My instincts saved my daughters life on multiple occasions. I have no idea if you are right in your guesses or not. I think you have a right to start asking questions. The thing we do that makes all the difference in the world is write it down. We write everything down. The other night my daughter had a fist sized lump in her stomach protruding outward, BIZARRE!!! We gave her a stool softener and wrote it down. We log everything from bowel movements to colds and coughs and how long she sleeps. She has terrible immunity, is tired a lot and will sometimes sleep 12 to 14 hours and she's 6. Her siblings will sleep about 2 to 3 hours less per day. She's tough though. She won't back down.
I do not believe you are over-reacting. We had 3.5 years of keeping my daughter from deaths grip and it was an epic battle. You need to be asking all of these questions and more. You need to find the leading pediatric care giver nearest you even if that's 1000 miles away you need a provider you can team up with to break these problems down.
Do not give up. Do not ever doubt your love and desire to protect. Do not ever ignore your instincts to protect and love. God gave you these things that you might be the hand that covers your childs life and you must be constantly vigilant.
If I can be of any help let me know. My advice is rise up and fight. Knowledge is your weapon and vigilance is your shield. Your security will come in writing it all down so your provider can review it and see trends or patterns.
I wish you all the best. We (those of us in these shoes) have a very tough job. I can also help you with questions on apnea though there is a doctor roaming this place who is very good.