I Agree with all that was stated above, don't get me wrong having qualifications behind you is never a bad thing, and could get you web design jobs in certain companies.
But I truly believe that you don't really need qualifications, you just need the experience to show off you web portfolio of all the work you have done before now, then the employer would know what you are really made of, especially as someone like you, who has got the qualifications, but still doesn't feel like they fully know what they are doing.
I would keep learning from your qualification, but keep building different websites to show off your work

Even people proffessional in the business are still learning day after day
Cracka
