[SemanticStrengh]

No Vyvanse actually is prescribed in many european countries so maybe it is for yours, for example it is prescrined in UK and in germany under the name Elvanse. How do you know a pharmacian has the right to order it? If it is not explicitely allowed in your country what make them allowed to do so?

Omega 3 have mixed evidence, they probably help slighly as augmentations, like guanfacine.

Your cold extremities are probably because of vasocontrition, you can cancel this with low dose (1-3mg) daily tadalafil (yes the sex pill), which is available OTC btw.

As for the methylphenidate half life, if that is a huge problem you can try atypical stims cf my original comment (selegiline, amantadine, moclobemide or the inferior moda/armodafinil) or get prescribed serdexmethylphenidate (probably not yet possible in europe) or you can do the easy fix, buy 4f-mph which is an OTC methyplhenidate variants available on https://rarechems.com/ however while unlikely, it is possibly more cardiotoxic and neurotoxic. Anyway you should fight cardiotoxicity and neurotoxicity (the former via e.g. tadalafil, the latter via magnesium l-threonate, ALCAR and antioxidants such as NAC)

> Thanks for your comments. I don't understand much of it Feel free to ask any question for clarification