Why are we both having medical problems all of a sudden?

I'm 23 and my husband is 25. Within the past year we've been having some medical problems and I'm starting to wonder if it's some sort of environmental factor or something because we just moved into his dad's basement about a year and a half ago and since then we've both been having some medical problems. We've each put on about 30-40 pounds. My periods started getting off track and the doctor had me get an ultrasound and now I have to go for more testing because they found something suspicious. I've had the flu twice. My energy level has been very low. My libido is practically gone. I have GERD. I was diagnosed with Scoliosis in January. I also have an unexplained throat problem. The doctor can't figure out what's going on so he's labeled it as an allergy problem for now but basically, my throat get's tight and give me headaches and I have a hard time swallowing and I cough for about 30 minutes after every meal. My husband has had bronchitis and the flu this year. His energy is low, libido almost gone. He started having stomach pains last week so I took him to the doctor and they did some blood work and his liver enzyme count came back very high so they are doing more testing to see what the problem is with his liver. The amount of medical problems between the two of us is getting ridiculous so I'm thinking that something is causing all of this. Why would two 20 year olds be having so many medical issues? We eat healthy, we stay active, we both work, he goes to school too. We want to get out of his dad's basement but he was laid off from his good paying job and we're trying to get to the point where we can afford to move out but it's going to be a while. Maybe another 6 months to a year. What do you think could be going on? Is this just a coincidence or is something more serious going on here?