Weight gain

Hey guys just trying to figure some things out. I've gained like 10 pounds in the last year and no matter what I do I can't seem to get it off I weigh the most I've weighed in 30 years. I'm normally around 1:20 and I'm like 131 right now. I am curious if it could be histamine intolerance? And I'm wondering if celery juice, red light therapy or coffee enemas help? Also a dao supplement. Thanks for your help.