I use it in addition to prescription medications. I'm at the cusp at where the side-effects of those outweigh the benefits. They really help, but don't go all the way. So it provides me with a good reason to do what I enjoyed doing anyway. 
 
I smoke cannabis to help control muscle spasms, and for both neuropathic pain and muscular/skeletal pain (not all the spasms are controlled). And I find the side-effects make dealing with chronic pain easier - it hurts, but at least I can have a good giggle about it. 
 
I've avoided eating it for well over 20 years. I found it too unpredictable and the effects could be unpleasantly over-intense. I'm in total ignorance as to whether there are any edibles with the psychoactive compounds removed.
 
Perhaps see how your current regime works out in the next week or two before monging out on space cakes.
 
The problem with taking or breeding compounds out of the plant is that cannabis has over 40 different active compounds (various different THC and CBD compounds and so on) and researchers are still learning about which compound has what effect. 
 
With regard to children with epilepsy, there have been a couple of high-profile cases in the UK where cannabis oil has been shown to help children with severe epilepsy where other treatments haven't worked. It has even led to a minor change in law to allow licences for its use in highly restricted circumstances. It's a very small step in the right direction.