Your crash in libido could be caused by raised E2 levels!
When I cycle I wait some time before I use an AI (i don't use it preventive). Even on high doses of test and dbol etc my libido is completely gone.
When I start the AI (Adex at 0,5mg EOD) my libido comes in full force after a few days. Hell, I'll bone everything in sight (excuse my French).
High Test levels => arom => high E2 = low libido.
To test my dosage of AI I check my morning wood and adjust the dosage accordingly.