I was once again gong to suggest Lyrica but I reread your text and see you tried it for 6 months ? It never helped for an extended period of taking it for 6 months? I also think green tea extract capsules are worth a try. Are there any other meds on your list that you plan to try to see if they help? I don't think a blood test necessarily is effective in determining if you have an infection. I think you need an x-ray or CT Scan of your foot to see what the localized inflammation looks like and see how it appears to have manifested itself, and if it looks infected. I think taking an antibiotic for a week or so is a pretty easy thing to try to see if it helps. As for the sacroilitis, would a steroid injection be worthwhile since the doctor definitely identified inflammation in the sacroiliac joint. I apologize if I have suggested things to try that you have already completed, there's a lot to read in your text message.