I'm having such a situation. My son and I got sick before New Year's, …

I'm having such a situation. My son and I got sick before New Year's, we recovered, two weeks later we got sick again, we recovered, now we're all sick again, it started with my husband, then me and the kids. We go to doctors, we treat according to their prescription, I don't understand why we can't get better. Girls, cute ones, maybe someone had this too, how did you cope, what did you do? I already ordered vitamins for immunity, waiting for them to arrive.