In very simple terms, withdrawal from stimulants is pretty much what you're imagination would perceive as opposite of the primary effects.
Instead of a million great ideas, you'll struggle thinking clearly.
Instead of energy, you will be lethargic.
Rose colored glasses become gray. If you ask me, this both physical and metaphorical. Life literally looks gray, like watching a black and white movie. You perceive the colors, but you can't feel them.
The way you've described your usage...
80mg Methylphenidate (Ritalin) is a moderate-high dosage. For instance, a lot of people are limited in their intake by the peripheral side effects of the drug.
Taking anything over 120mg-140mg per day is going to have a person geeked out.
For more perspective, a daily user of Methamphetamine can sleep for 5 days straight, waking only to urinate and then move on to a week of brain fog followed by resolution over weeks/months.
I'd guess you will experience some brain fog, anxiety, depression and some somnolence for 48-72 hours before you start rapidly feeling better. You could be feeling "normal" within 7-10 days.
I know thus sounds scary, but all of this should be mild and manageable. It won't kill you. Just prepare for some challenging days but be optimistic that it will be a short phase.
