I have serious problems with my Camry.

Hi, I have serious problems with my Camry lately. About 3 months ago I replaced my old engine with a new engine. After they fixed the engine I saw I still have engine light on and asked them to check on it. They found that one of my transmission solenoid is bad and needs to be replaced. As you understand after replacing the engine I really was broke and couldn't afford that. Now I drove my car after that about 3000 miles without having any serious issue except the engine light was always on. Anyway, just yesterday around noon I noticed that the car started shaking with some cranky sounds from engine while I'm driving but it was not persistent. So I drove the whole day until at the end of the day when I was trying to park the car in front of a store it really made horrible cranky sound all of a sudden! Then I immediately put it on parking but noticed that the car was still rolling back slowly. So I pressed the break and it stopped rolling. I was intrigued enough to check the engine at that point to figure out the source of the sound. However, as soon as I opened the hood of the engine to check it the car started rolling back again and didn't let me get in and stop it. So the car ended up hitting another parked car. I tried to even move the car immediately from that position but as soon as I tried to start the engine it started making cranky noise again. Anyway, later I had to tow the car to my apartment complex and today when I was trying to check again if it can start I see that it can successfully start the engine now but as soon as I put it on drive it makes that cranky sound and won't move. So anybody has any idea what is wrong with it and approximate estimate I have to spend in order to fix it? BTW, I was checking the fluids this morning and saw that coolant, steering fluid and wiper fluid all are almost nil but not sure about transmission fluid as I failed to locate it under the engine hood.