I've been having trouble getting an erection and my penis seems a lot softer than it usually is. I can't get fully aroused and I go soft and limp really quickly, and have problems trying to get aroused again. I do masturbate every other day or some weeks 3 times but this has just happened within the past three days, and haven't had a problem like this. Should I go see my doctor about my issue, or is there something I can do.

Stop doing masturbate please!and do some exercise ,having something full of alimentation,and you will be fine soon.

You didn't mention anything about your age whether you're in your teens, 20's, 30's, etc. or if other things are going on like stress, physical exhaustion, too much alcohol, drugs, medication, relationship problems. There are multiple things that could be causing the erection problem.
It is possible to tax your body by over-masturbating. If this is the case, take a week off and allow your body chemistry and hormone levels to recover.