Stop worrying, May's a long way off and interest rates are forecasted to come down by then.
Very timely but got moneysavingexpert newsletter this morning, ashamed to say that I never get around to looking at it properly which I should (ironically too busy working to try and pay everything!) but this looks promising for you - you can fix a deal now:
"Finally mortgages are getting cheaper? To the relief of stretched homeowners, the sun's peeking through the mortgage clouds. In the last week Abbey, HSBC, RBS & Natwest amongst others joined Nationwide, Halifax, First Direct and C&G in offering new cheaper fixed deals. Some pretty decent rates are now around e.g. two years fixed at 5.6% with a £500 fee, substantially lower than a few months ago.
Does your deal end in the next six months? It's possible to search now and reserve the best rate you find for a small fee. While some predict rates are going to keep dropping, if they do shoot back up, this means you're sorted, and if they fall ditch it for a better rate and you only lose the relatively small booking fee.
Find the best deal, use the free broker-plus technique. First ensure you're fully briefed on exactly what to look for, read the free 40 page Remortgage or Mortgage guides. After that find the best specific deal, use a whole-of-market mortgage broker, then check for any direct-only deals brokers can't advise on (read the Free Mortgage Advice article for a full explanation)."