Dreading a very likely future health situation

As long as I can remember I've suffered from night cramps (known in the USA , I believe, as 'Charley Horses'). In my family it's been only me suffering among us five siblings, but my father also had the complaint. When I was younger they came on rarely, maybe only two or three times in a year. But getting older, it's become more frequent till now it's a nightly fear. When they were occurring at the rate of about once every week or so, I told my doctor who prescribed Quinine Sulphate tablets, to be taken every night before retiring. They seemed to make little or no difference, but they also aggravated my already debilitating fractured sleep patterns, so I ceased taking them. Of course the threat of oncoming cramps continue to come on regularly and relentlessly, and I still have to jump out of bed to arrest it before it can take hold, otherwise if it's allowed to, the pain is so extreme in it's agony that if there was the means close at hand to end it all I do believe I might be sorely tempted. Anyone who doesn't experience these 'night cramps' just has NO idea! The absurd and inconsequential mild term of description doesn't even begin to reflect the magnitude of the pain. I simply cannot imagine there being anything more excruciating that it's possible to suffer. Only very recently did I become aware that jumping out of bed at some point has become just about a nightly occurrence now. I looked up the condition on the Internet yesterday but it didn't really tell much that isn't already known - suggested preventatives being going to bed well hydrated and doing calf-stretching exercises. So yesterday evening I drank plenty of water and did the stretching. The result? I had to jump out of bed twice last night. Some years ago, for the first time that I remember, I got it in both legs simultaneously and wasn't able to stand up in time to stop it. God, as a result of the absolutely dreadful pain, the sweat poured out of me while I bit and chewed on the pillow. I really thought my heart was going to give up as I heard it thumping fortissimo. I was praying for deliverance - anything, but please take this hideous agony away! After possibly the longest two or three minutes of my life it eventually passed, leaving me drenched, panting for breath but ever so thankful it had receded.
I suppose I can continue to live with this condition (what choice is there?) - but for how much longer? I'm terrified of when the time comes when I just cannot manage to get out of bed in time to stretch the calves before the pain sets in on its inevitable arc of indescribable agony, and even moreso when the time arrives when I've become permanently bed-ridden and cannot rise at all. I'll be screaming and yelling so hard my vocal cords will snap. What a horrible prospect in store. If only a really effective remedy could be found - quickly.