Suggest Treatment For Constipation And Stomach Bloating

Hi, I am a 24 year old female, I have been very constipated for almost 3 weeks (only able to go very incompletely and with great effort every three or four days, whereas I usually go at least twice a day). At first I attributed this to a (only mild) change in diet/activity due to traveling, so I only took glycerin suppositories yesterday (2 of them) These helped a little but it was still a bit difficult to go and I still feel very bloated and not fully relieved. What could be going on and what should I do? ( I have been eating a regular amount of fiber and doing a fair amount of activity, drinking about a cup of coffee per day and drinking lots of water. I have PCOS in case that s relevant, and am quite sure I m not pregnant.)