The hug is not fun at all!!! Like Sleeper, mine is not the same every time, but it consistently is a squeezing/pulled muscle feeling and/or electrical shock feeling. For me, it mostly effects my left side and oddly laying on that side can sometimes feel the best. Laying flat and standing would be next. Sitting can be unbearable when it is acting up.
Also, for me, heat tends to make it worse but ice seems to help. I can handle a warm shower, which helps relax the muscles but not a heating pad or heat pack. I have tried Salon Pas on the ribs and sometimes it helps and sometimes it doesn't.
I would definitely contact your doctor as you may be in a flare. Let us know how you are doing. Gentle

's!