I don’t think you have an underlying condition kirstyk4; I believe this is something that we all have been dealing with one way or another.
The game changer for me dealing with constipation came when I tried acupuncture. Right afterwards I experienced 2 footer stool samples pretty much every time. This will be effective for weeks until you will have to do it again for the same problem. Acupuncture can help with other ailments as well such as depression, detoxing, stress, etc. I highly recommend it because it is one of the things that really helped me get better.
Here is the constipation remedies post from awhile back:
Chamomile tea is great for constipation as well!
Probiotics can cause constipation, so if you stop probiotics for a day or two, it could help or improve the movements.