Can't sleep

I absolutely cannot sleep on my left side.. I have never been able to. I've always slept on my stomach. Now that I'm nearing my third trimester I know that's not recommended, and I should only be sleeping on the left, but I can't and I haven't slept in 4 days due to the discomfort. I have tried different pillows and I'm on meds that should help me sleep, I still can't.

I am so exhausted I could cry.