I would never give you medical advice nor do I even know what these drugs are. I presume you are using them off label as well. No judgement, you have to do whatever you can to make your life better while you can. I do know that the pharmacology of many drugs in generally can be potentiating or synergistic. They can also cancel each other out. And they can have systemic effects as well if you are taking them orally. Hell even if you were applying them to your skin. Lastly you dont know the exact pharmacokinetics of them in your particular body, you could be building up toxic levels of the drug- or some other substance- even and your "tingling in the head" may be completed unrelated to the two drugs you mentioned. You'd have to ask a proper pharmacist. All I can say is god speed man. Do continue to share your entire experience.