Getting pregnant with baby #2

I’ve been really wanting to have another baby but life keeps getting in the way. I feel like I’m sick every month for the last year and most recently had pneumonia & shingles..at the moment a cold thanks to my 2.5 year old. I’m really worried I won’t be able to get pregnant or I’ll hurt the baby somehow since I’m always sick...I’m worried I’m getting older all the time(I’ll be 34 this year). I’m worried the LOs will be to far apart in age....anyone else feel this way? Any advise? Words of wisdom? Anything