Allergic reactions to feminine products

Finally got my period after being late 2 months. But now I have another issue. I can't wear tampons because they are extremely uncomfortable, and give me the worse cramps ever. Pads, I've gone through three different brands before I finally wouldn't break out in a rash. Now, I have a rash with this brand. I can't do always, equate worked for a while also, until I started getting a rash from them, so I went to u by kotex, again, rash, so I went to the basic kotex, and now a rash from this brand. I know it's the pads because it's a rash from where the pad sits. If I don't use them, it goes away after a day or two. I change them frequently, even at night. I am seriously considering a menstrual cup now. Where do I go for one of these, and what would you recommend? I was always against them, but now, I'm basically out of options. So please ladies, give me your opinion about the best cups, and the best way to get them.