HI Well come to HCM I really appreciate your concern, as long as the fibromyalgia is concern it is not the pathological illness but it is the functional kind of disease, and for the neuralgia underlying cause of this is matter of concern, in my opinion best way to come out of this condition is to stay away from the stress besides the medicines you are taking, you can well adjust the time of medicines it is not the dig deal but the safe is keep time gap in between this two drugs two hours would be better hope this information helps.