99 Stratud Overheats when driving--now oil light comes on

Hello! I really need some help with my 99 Stratus (2.4L). For a few weeks, my husband and I noticed that our car would get a little too warm (temp gauge reading) at the end of the day. We would lose coolant after turning the car off, particularly if it was a rainy night, the next morning there would be coolant on the ground.

We replaced the thermostat, bled the system, replaced the upper radiator hose, took out the reservoir (and it was gunky) and washed and dried it well. Put all back together and filled the system with new coolant---and disaster! We test drove it and although in park it runs like a dream, when you drive it a couple of miles, it overheats dramatically, and if you slow down it shudders to a complete stop and turns itself off, and the oil light comes on! (Just did an oil change, too). Scary when this is all the transport I have!

My loving husband and my brother "wiggled" the new hose and thought it might just have a kink in it, which it did not. Unfortunately, they decided to test drive it again and not only did it behave the same, when they opened the hood there was a distinct smell of oil burning off somewhere. AAA towed the car back home.

Of course money is an issue so I need to know what I'm doing when we take it to the mechanic--or fix it ourselves. Or junk it.

I'm terrified that the head gasket is shot, and doesn't that mean that the car is done? Could it be the water pump/timing belt combo? What about the oil smell? All of my fluid levels, even after this most recent test drive, are normal. Also, we already replaced 2 belts this year as we found they were original to the car (we bought used in 2009). I'm sure most everything else is, too.

If someone else asked y'all this, I'm happy to refer to that answer--I just didn't see a question answered that was exactly like my dilemma.