Who diagnosed you? I’d be looking for more opinions myself. Have you been referred to a physio or a podiatrist? Two things stand out for me here:
1) the ball of the foot is not a common place to have OA
2) it is unusual for OA to go from zero to screaming agony like this- it usually builds up over months/years.
You may have been diagnosed by your GP, who do an excellent job and somehow manage to be knowledgeable about the whole vast sphere of medical science, however they are generalists, not specialists, and as you may have heard in the news resources are waaaay over stretched right now.
Anyway I’d be wanting to rule stuff like Morton’s neuroma out first. Ask for a referral or see a podiatrist privately if you have not already done so.