Drank a ton of water, paced, rested as much as I could. The discomfort passed after about 36 hours - I just sort of rode it out. I benefited too from benzos that my doctor prescribed for bedtime. Went off them after a few weeks (should have been a few days but I didn't know) and all is well.
I highly recommend a visit to your physician. Is someone with you that is aware of what you are doing?