Happened to me..switched to Avodart...all good.
If you do dermarolling dont go overboard re depth and frequency.
You may feel too uncomfortable with too much depth. You are most likely give up one day...go easy.
Frequencywise...there is a lot of info on the web. Depth determines frequency. If I were to do it..1mm every two or three weeks. Most likely you wont need numbing cream then.
1.5 once a week during a shower isn’t that bad. Wash hair first. Use clean dermaroller. Do it. Blast hair with cold water after shower.