Inner Ear, you have definitely brought up an interesting, if merely hypothetical question.
It is a fact that vitamins and minerals are effected by diet. There is no question in my mind, that toxins, chemicals and diseases, also contribute to this as well, all of which contribute to the"leeching" of minerals from in this case, bones.
I have to research the amount that can leave bones and at what speed. Usually something like this takes years to accomplish. Drug use, especially hard drug use, will speed this effect up
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You mentioned that you had a previous, heavy habit, but after, use was infrequent(subjective) and now you picked up use again, correct?
Some of the side effects that you have mentioned, sound like overuse side effects of stimulants in general. The bone issues can be: the cumulative effects of years of drug use, mixed with lack of a proper diet and nutrition, or a more serious medical condition that has come to light now. If your not a junkie cocaine user, that at least is in average, overall health, then you may simply be, as Mad Dash has expressed, experiencing effects of some really nasty cuts, that you may be allergic to, or are straight up poison.
Now lets add insult to injury. Let's suppose that during your heavy period of use, you were healthier, and your body could handle much more cocaine and the various impurities/cuts/poisons associated with it. You took a break or various breaks from use and got back into it. Now, the shit is 35-70% purity, with worse cuts.
The picture I am trying to paint is, all that may have added up and has begun really fucking with you.
I apologise for hopefully an off topic response, but there is a nice, quite realistic, worse case scenario for you.
Your overall condition is very serious, IMO. I had cancer and everything you have said means get checked out.
Quit the shitty coke, eat easy to ingest health foods, drink plenty of water, Gatorade for some sugar and to get your electrolytes balanced, * if you do not feel like your going to have a heart attact,or die in a few hours, wait till you are clear from cocaine on a urine test and go to a hospital feeling poisoned. You need to be seen. If you can put up with it till you test negative for at least coke, try to relax, I run to benzodiazepines when I feel like shit. I feel for you deeply, thats why I posted a letter.
Get better and please post back with a follow up if possible. We are a harm reduction site. Your thread may open many peoples eyes.