I sympathise, and it does get better.
DS has a congenital airway deformity meaning his trachea and larynx collapse and he goes into respiratory distress, very susceptible to colds, borderline ok immune system and borderline ok cilia so can't clear his lungs as well as most. He also has asthma and allergies, has had a pneumothorax, and amongst the many many chest infections he's had one of the multi-antibiotic resistant infections.
After being on a ventilator after birth he spent his first year and a half with emergency admissions to hospital approx every 3 weeks, with chest infections and respiratory distress. We were on first name terms with the A&E and children's ward. He is pathetically docile with doctors as he's so used to having his sats measured, stethoscope etc. If he sees one he pulls up his top, even now.
He missed so much of the normal baby life DD had, as he was either actively ill, and needing round the clock nursing, or he was well and we were told to keep him out of the usual sing n sign etc, because he was too vulnerable.
He didn't grow properly because he was poorly all the time and his speech was delayed. He has caught both up now, but it added more apps and worries to the operation, procedures, testing for various life-limiting diseases... that became our life.
After the age of about 1.5 the hospital admissions decreased a lot and I was able to go back to work with him in a normal nursery (with special precautions). Then a couple of years with maybe 2-3 emergency admissions. Now 4 yrs old and only 1 admission in the last 9 months, so think we're finally getting there!
Can you discuss emergency plans with his consultant and GP? We were trained to check his chest using a stethoscope, and basically nurse him. We keep charts, monitor pulse rate, resp, rate, temps, capillary refill etc. So can monitor him and make better decisions, as well as provide a good handover when we do have to take him in.
We are permitted to keep a supply of his antibiotics at home for those awful Saturday night/bank holiday breathing troubles. Meant we can keep him at home - if we phoned 111 for out of hours we'd end up with an ambulance whatever happened, because he sounded so awful. With the skills we were taught (and I've done a lot of first aid stuff in the past), we were able to judge his condition better and lead a more normal family life, though we always check the location of the nearest paed A&E when we go on holiday.
It's really tough and you feel like he's lost out on so much fun, and nice time with you in that first year, and you feel like you didn't get that lovely maternity leave with time to bond with him, and make friends, and go to do lots of things together. If it's any comfort he's now a very well adapted little boy, and settled beautifully at nursery, made friends etc.