If indeed you had the bulls-eye rash, you could well have Lyme Disease. Presumably you've told your doctor about that? The "usual test" for Lymes, sort of a "first response" test, isn't real accurate, and you might need to get more extensive testing done.
An MS-related flare, or exacerbation, is defined as NEW symptoms, coming and lasting for at least 24 hours, or a serious intensity of OLD symptoms, lasting at least 24 hours, usually for several days, and subsiding back to what it was..or nearly what it was like before the flare occurred.
What you're describing is what I call "residual symptoms": you've had an exacerbation (or flare), damage has been done to your nervous system, and while the flare has subsided, the damage continues to make itself known through the sort of stuff you describe -- numbness, tingling, sometimes tingling that comes and goes through the day, sometimes spasms, cramping,that sort of thing. I find the symptoms I experience seem worse at night, for two reasons: when I'm busy with stuff during the day I don't notice them all the time..I'm distracted with other stuff. But at night, either when I'm vegging out in front of the TV, or getting ready for bed, the distractions are considerably less, so I notice the twinges and zaps and stuff more. The second reason is that by evening I'm way more tired than I was earlier in the day..and fatigue seems to make the symptoms worse.
But again, if you indeed have had a bulls eye rash, and continuing to have rashes...get to a doctor and have that checked out. Lyme Disease left untreated can cause all sorts of problems!
...I am not a doctor, nor health professional, and don't pretend to be one, here.....