This dude seems to have been too aggressive. I might be in the same boat.
I do think I might be over training.
This says to not do interval training
Drop the intervals, increase the mileage. IMO A good base for maintaining fitness is 25-30mpw. If you're much below that, you just don't have the aerobic base to support what you're trying to do.
My Z2 pace was a 13/min mile when I was running marathons and ultras. It's not a big deal to be slow. Go run easy for a long time and find a way to enjoy yourself. If you're just in this to be really fast and you don't have the patience for being new, you're just gonna be disappointed.
Maybe increase the mileage to break the plateau....
Forget interval training. Run in zone 2 during all of your runs. Slowly increase your weekly mileage (max. 10% per week). Do this for 3 months then report back.
Stress has ability to rob anybody from running progress. It is possible to get your blood/urine/saliva tested for cortisol levels.
The Rolex Life 
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