Skin mottling/raynauds linked to stimulant meds?

I have been on quite a high dose stimulant med for about 2/3 years now , did the whole 30 mg elvanse start and made my way up to 70mg elvanse and 20mg amfexa top up. Main side effects I had at the start were dry mouth and sweating. These have kinda levelled out and not so bad anymore. However this last year I have really felt a decline in my health. I have had 2/3 occasions were I have had an episode where my right foot/toes goes pale white and numb. Or my legs have got really mottled. I haven’t had any heart palpitations or any chest pain throughout. But I have noticed in a decline in being able to handle physical activity and breathlessness aswell. Now that could be totally irrelevant as I had asthma as a child and I am a smoker. The mottling and white numb toes/foot is the one that freaked me out. Has anyone else experienced skin mottling or raynauds with stimulant meds? My blood pressure and pulse has always been fine too