Back pain

File: lower-back-pain.jpg (39KB, 600x451px) Image search: [Google]

39KB, 600x451px

So recently I've been having an issue with my lower back when performing squats and deadlifts, it's only been the case for the past 3 weeks or so
when i squat down past parallel or perform a conventional deadlift i feel a sharp pain in pic related, i can push through the first 3 sets but after that it gets to painful, i know my form is correct, have asked bros at the gym if I'm doing it right and it's only been recently that this pain has been occuring, I've been lifting for 3 years as well
I think the cause might be that i've been sitting and laying in bed to often recently so the area has become to tight, but I'm not sure, anyone know of any stretches or something that could help