Heavy lifting and anal fissure. Testing?

Hi all, I had an anal fissure in January due to travel related constipation. It bled for 18 days and then it stopped. It again bled for a 2 separate days in February when I passed hard stools and for 5 days in March when I had another episode of constipation. Since March I'm on a plant based diet and I hadn't had any symptoms. On Friday, I lifted something heavy (25kg) and moved around. Since Saturday it pains in the same region as the previous anal fissure. Can heavy lifting cause anal fissure to reoccur? I had gotten a colonoscopy done in 2011 which was normal and a sigmoidoscopy done in 2014 which indicated anterior and posterior fissure along with grade 2 hemorrhoids. Do I need any further testing? What can I do to make sure it doesn't reoccur apart from following plant based diet