Recurring anal fissure. Be the cause?

Hi all, I was diagnosed with fissure (both anterior and posterior) through short scopy in 2014. I've had fissures on and off, but since January they have become more frequent. I had a bad case of constipation in January which caused fissure and bled for 3 weeks. It then stopped and bled a few times in Feb and March. I changed my diet and I was having semi solid bowel movement so far. However, last week I had a solid bowel movement (but not actual constipation) and the same spot of the anal fissure started hurting again. There is no bleeding yet ( I have had 5 bowel movements so far after that), but a very very mild pain. Even today I'm not constipated but the pain came back. What could be the cause? I'm worried