First of all, get the disc taken care of. Go to the doctor and make sure it is/isn't a disc bulge.
As for exercises in the meantime or after treatment of the disc:
1. Stick with single-leg exercises. Forget about doing conventional deadlifts and squats for a while. If you execute the single-leg lifts properly, you'll reduce back stress quite a bit and may actually come back to the bigger lifts even stronger. Personally, I'd stick with split squats and maybe some moderate-height step-ups for a little while, to avoid the "jolt effect" of moving lunges. But I just like to be extra careful. It's up to you. (If by any chance you have a slideboard, then slideboard ham curls are pretty good for working the hams/glutes with no loading. Just use a controlled range of motion: don't tuck your heels all the way under you. Stop curling when your heels are directly under your hams, and squeeze those glutes to keep your hips up!)
2. When benching, either elevate your feet on steps or do floor presses. Either of these will reduce potential low-back arching.
3. Work on some classic "core-stability" exercises, in order to disperse the stress properly. Get all of your "abs" firing, and your glutes too. Side and regular planks, bird dogs, perhaps some supine bridges. Do these in short-holds and reps, not very long holds and certainly not weighted. Just get things firing and move to the next exercise.
4. I'd avoid overhead pressing altogether for now.
Hope this helps a bit.
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