I so agree that it takes time for guilt and regret to lesson. Stick with it and it will. Sometimes it will feel as though amends just aren't enough; never enough. And, it may feel as though you'll never forgive yourself....
But like a knot you get in your trapezius muscle, it's got to be worked out somehow...and we all know how those knots can feel....like they'll never dissipate. Hang in there and don't give up.