Michelle, living with constant pain drains all joy and ease from life. You shouldn't have to deal with this all the time. Pain (with associated fatigue) is my main problem as well. Nerve pain in my face and head and the skin of my upper torso. Other places too, at times. Won't go into that.
I know all too well the shortcomings of medicine when it comes to treating pain. But I also know there are many, many alternatives. Until you've exhausted at least a few, please don't give up. I don't know where your pain is. I don't know if you've seen a pain doctor. Please, find the energy somewhere to look for other options. Different drugs, different methods of taking the drugs, "alternative" therapies......
I was not helped at all by intermittent doses of narcotic strength meds taken "as needed." The only form of relief I have found is to be on daily, consistent doses of morphine, and the added umph of anti-seizure meds for the nerve aspect of my pain.
This doesn't recommend that you need the same. But I will tell you this, once you're hurting so bad you cry, nothing will help much. If you have chronic pain, you must stay ahead. If you put off a dose because you aren't hurting much, later when you ARE hurting, the dose will be much less effective than if you had a steady level of that chemical in your body.
I know I'm droning on, but your post just kicked me in the heart. I have lived with chronic, nearly constant pain for 4+ years now. It's horrible and I don't want anyone else every to experience the same. I will tell you, you have to create some way to find relief in your head and heart, even when your body is in pain. I can't tell you how to do that. For me, it's been a mixture of meditative practice, breathing and finding an outlet for all that's pent inside me. I, who was nearly banned from the crayons in kindergarten, have started letting a tiny bit of art spill out of me. There is huge comfort in fondling soft pieces of fabric in beautiful colors and then attaching them to each other. I don't know what your outlet is or where your inner safety will be found. I will send prayers and good wishes and many healing thoughts to you. And if you want to "talk", I'm as close as a PM or email.
You aren't alone. Misery loves company --

-- I will be happy to help you through any way I can.
Soft hugs,
Sunny