Mazel tov on the birth of your precious baby, and refuah shelaima from your condition. You have not one but SEVERAL reasons to explain your tears. You ARE hormonal, your baby is demanding at this point, and you are ill, but getting insufficient rest. Have someone find a mother’s helper for you, so you can rest between feedings (money well-spent, or find a chessed student who needs the hours). The main thing is the resting. it will help with your recuperation both from childbirth AND pneumonia. Your husband or other family members need to step up to the plate if they have not already done so. If I am repeating what others have already posted a) we are all correct and b) I have not yet had the chance to read them all, but wanted to reply ASAP.
And I know it’s an old saw, but SLEEP WHEN THE BABY SLEEPS. DO NOT use that time to make calls, or catch up on laundry, cooking, etc. Your baby will not appreciate a mom who is exhausted, and if you are always exhausted, how can you optimally appreciate the miracle of your baby? If people ask how they can help you, ask them to watch the baby while you rest. I cannot say that more strongly.