My GRE scores are pretty much exactly like yours. 158V and 154Q. The first time I took the GRE it was much lower. I got up to a 154 taking it my 3rd time. Part of me wanted to take it again this year, but I ultimately decided I should focus on other parts of my application that I know I can make better. And a 154 isn't a terrible score, I don't think at least (depending on where you apply I suppose).
Two years ago I interviewed at UC-Davis, it was not for a clinical program, but it still is a competitive school. I ultimately did not get an offer due to pretty different research interests that were realized once I interviewed, but I got the interview with those GRE scores. Last year I had a pre-interview over the phone at WashU-St. Louis for clinical psych...a super competitive program. Again, I think our research interests weren't a great fit and he was just putting some feelers out among people who applied for his lab...but obviously I made it through the first and maybe second pass with those GRE scores.
I would say, if you feel that you really have the time to put an effort into re-taking it and think you might get a better score...it doesn't hurt to try. But it's an expensive gamble if you aren't sure. And, depending on the rest of your application (like a 4.0 honors gpa, research activity, academic work, etc.) it really may not be necessary to re-take. Personally for me, I'm working on bulking up my academic work like publications and presentations instead of focusing energy/time/money on the GRE again.
But again, this depends on what your goals are, what schools you want to apply for, etc. If you have "The Insider Guide" it gives a pretty nice depiction of what the GRE scores of the previous class looked like to compare yours with. I'm sure you'll make the right decision for you!