I Had A Colon Test Because I Had A Change

I had a colon test because I had a change in bowel habits over the past year. I was told by the specialist that I need to go on a hi fiber diet because I have diverticulitis. I have had no pain, just many loose movements. My GP recommended Metamuscil & I have been on it for almost 2 weeks plus adding more fiber to my diet as it is a learning process. It seem as I am having more bowel movements (for example 3 in hr) Do I need to give this more time to see if it will get better? Or should I go see the specialist again? It is interfering with normal life. I am 72 and otherwise have no health problems.