I think you bit off more than you can chew. Your puppy is causing you a lot of stress and having to deal with a sick dog on top of that is just a lot for a single person. Dogs require a lot of time and attention and your current living situation just doesn't allow for that.

I would highly recommend you look for someone to take care of at least one of your dogs for a while. And you should even strongly consider giving up your 4 month old golden retriever while there is still enough time to properly train it. Rehoming it now is probably the best for it.