You may call city 311 and ask if any department can help you.
If you are living in a rented apartment building, call the landlord as the landlord is responsible for finding you the service for free.
You can do all these:
Wash all your clothes and sheet in hot water. Seal them in plastic bags so no more bugs can get in.
Check all your furniture and try to find out the root. Through that furniture away or leave it outside for as long as you can. Hope the cold weather can kill the bugs.
Some website says put a tape around the bed. Bugs will be glued onto the tape.
A few months ago, my friend got the same problem as you have now. She bought over $1000 pesticide from home depot and spray all the bedrooms few times a week. It did not work very well as the pesticides are not made for bed bugs. Finally she found out the home of bed bugs under a night standard and threw it away. I never heard her complain again.