What do I do about this smell in my house?

I’ll try to make this short…

One day about a month ago my girlfriend and I noticed that our living room, all of a sudden and for no apparent reason, had this weird smell. We didn’t do anything about it at first because, well – we can be lazy like that sometimes…

When it didn’t go away for a week I got frustrated and spent an entire Saturday cleaning EVERYTHING, floors, walls, windows, you name it… The smell of Pine Sol held for an hour or two but the smell didn’t go away…

I was stumped and frustrated but I have a busy life with work and had to forget it for a little while.

Then I started noticing we had a lot of flies. Small little flies, I’m not sure what you call them – that’s when I was like WHAT THE HECK!!?!?!?

All of a sudden, I got the hunch that the problem might not be inside the house, it might be under the house, so I went outside where there is a little- Not sure what to call it- a hole? A crawlspace? – it is outside and its a hole that leads underneath the house. It is usually boarded up but the board fell off a little bit. Anyway, I kicked the board and a SWARM of these flies started sputtering all around going crazy.

Now I REALLY think the problem is UNDER the house.

I’m not sure what to do from here. There is NO WAY I can go under the house, you need a haz-mat suit to go under there!

For the longest time I thought that something probably died, like a squirrel or something. But this has been an issue for a few weeks… like a month even! Could it be something else? Who do I call for this kind of thing?