I would 2nd the documenting portion. Document everything from fevers, malaise,sore throats, emotions, foods eaten, etc.....we found some sensitivity to milk products(had always been there but not at all severe) majorly increased after Pandas. Yogurt, greek and otherwise, milk or ice cream, cheese would mess with our dd much more so and can make recovery longer and harder.
Controlling inflammation is key. Ibuprofen is good but has some long term effects. Our dd does not have ASD diagnosis,but we were put on Enhansa, which is turmeric/curcumin. We noticed improvements with dd. Our youngest dd----- after putting her on due to some issues, taken off, then putting right back on with marked improvement. Kinda uncanny. I have also taken a curcumin supp for minor aches and pain. During the time I was on it (45days) I noticed it helped. For me, it was subtle, but did knock out inflammation. I was taking low dose different brand.
Also, look for other triggers. Ex. allergies to enviro and foods. We have tried to eliminate dairy which has helped. Also cat was gotten rid of. The way I understand it, you have to do everything you can (naturally or within your control) to get the immune system to "chill out". Part of the chilling out might be 10-30 days of azithromycin. That has helped us. Oldest dd's anxiety was gone as fast as it started----just took 3-4 months of fighting with(what I would say) annoying(what she would say) old ped and getting new ped/some abx.
Most of all, keep your head up and keep going with your gut. Educate yourself. Document. DO NOT BE AFRAID TO ADVOCATE FOR YOUR KID.