Like @saida said. Do a said number everyday. Stop doing lessons until the number of reviews is down to a mangeable level. Every lesson you do will generate more reviews and you have too many of them. It makes sense to stop doing lessons for a while.
You may also consider using the Prioritize Overdue Reviews script. It will make sure the reviews that are most overdue will likely to be scheduled first. This makes sense when catching up from a large number of past reviews. This will make sure that will make the most out of the SRS even though the reviews are delayed.