If you aren't interested in freelance work, try to look for companies with a dedicated research team. You usually won't find that in smaller companies, as they cannot afford a few people trying to solve a problem for 2 years with only a 60% chance of success.

PS: if you are really unhappy with your job (to the point where it affects you physically), don't think it will magically get better if you stay. It won't. This hope wasted 1 year of my life.