Personally, I'd take two weeks off from training if you've been going at it HIT-style. After those two weeks, start on a beginner program. Do something like this:
Day A
Squat - 3x5
Bench - 3x5
Deadlift - 1x5 / Row - 3x5
Day B
Squat - 3x5
Overhead Press - 3x5
Pullup - 3x5
Deadlifts are alternated with rows, OHPs are done standing, squats are full, olympic style back squats, blah blah blah. Train Monday, Wednesday, Friday, alternating the days.
Add weight to the lifts every session, provided you hit all your desired reps. When you miss your target reps, try two more times. If you don't get it after three times, decrement the weight 10-20 lbs. (depending on the exercise) and ramp back up. If this still fails, it's time to move on to a less frequent progression, such as the SF 5x5.
I advise this, simply 'cause you're likely not conditioned well, and a beginner routine can still work wonders for you. I also advise the time off to let your muscles and joints rejuvenate themselves, 'cause if you've really been doing HIT, you're likely pretty beat up. You will be if you start squatting 3x a week, anyway. Give it some rest, hop on the more-frequent-training bandwagon, and join us. And drink the magical kool-aid.