The Psyllium/bent can constipate some people, mostly because they fail to drink enough water. Get a jar or bottle for backpacking, the kind that holds a liter. Drink one of those with your B&P, then fill it again, and make sure you drink it down within the next 2 hours, fill it again, repeat.
If that doesn't do it, then you can take laxatives for 7-10 days, preferably not every day, be sure to take long breaks from them or you get dependent.
SAM-e is an amino acid. For an amino acid to affect seratonin levels and help with depression, it must be metabolized by the liver. If the liver is weak and congested, throwing it more amino acids won't really help.
They may have a short-term benefit because yes, having more amino acids available in the bloodstream increases the chances that the liver will get around to it, but still. Giving a car with a flat tire more gas doesn't help much, right?
The hypothalamus of the brain is quite capable of creating all the amino acids you need as long as you are getting the essential building blocks. It's up to the liver to do something with them. So in order to not waste your money, bring the liver up to speed and THEN try SAM-e.
If you were diagnosed as having a certain condition that limits your brain's ability to make use of seratonin, then it might help.
I occasionally take amino acids but I take only the essential ones - the ones that all of the rest depend upon. That way I don't upset my body's balance. I don't take only just one of anything, especially since they just get broken down and reformed into something else in the digestion process anyway.
There are forums here for products and testimonials, they may have more info on SAM-e. You can use the search field at the top of the page and it will find all posts on Curezone about SAMe.