1. Eat more protein and carbs.
2. Rest 10 minutes between squat sets if you are close to failing reps.
3. Stay on the novice program, especially if you are resetting. It is the quickest way back to where you left off.
4. Regarding your injuries, post to the Managing Injuries forum if you want to get the input of coaches regarding your rehab.
How did you injure your pec and groin? If this happened in the weight room, definitely post videos of your lifts to the technique forum.