So sorry you are having this worry right now and no I don't think you're crazy! The only way you can know for sure is to go to your GP and request a referral to your local breast clinic. Even if it turns out to be nothing serious, you need your mind putting at rest. Anything out of the ordinary MIGHT be cancer, so it's always worth getting it checked.
AND DO NOT GOOGLE, but I think you already know that. Just stick to this site, the Macmillan or the Cancer Research UK site.
Sending hugs and wishing you well.
Welcome to the BCC discussion forums where I am sure your fellow forum users will be along soon with some much needed support.
In the meantime could I suggest that you make an appointment to see your GP as soon as possible as all changes to the breast should be checked out, but pointing out that the majority of breast problems are not cancer but still need checking. You are also more than welcome to give our helpline team a ring and talk to them about your concerns. Lines are open weekdays 9-5 and Saturdays 10-2 the number is 0808 800 6000, calls are free.