Extreme Mood Shifts

so ik this is probably really normal but i just had one of the most quick and extreme mood shifts ever. so i’ve had depression and anxiety for over a decade without being treated and have kinda become numb to my emotions. but an hour ago i felt really genuinely happy but a couple minutes after that i felt really depressed, for no reason. i don’t understand bc i few minutes after that my mood switched again and the only way i could describe it is every emotion came at me at once. overall it was kinda overwhelming and confusing. i’ve never had that before, can anyone relate to this?