It takes a while for the £15 chicken and the £12 Mc Donalds to actually sink in.
Generally you'd want to multiply your UK budget by around 1.5 - 2?
What area are you living in?
I shop in Germany, it's similar, and sometimes cheaper than the UK, then I get my form stamped at the border office and when I revisit the supermarket I get the cash back on my German VAT. Also works in H&M, Pharmacy, Muller etc. I save it all (about 15 euros a week) and use it for Christmas.
So if you are on the border of France or Germany go there and do a "big" shop then go to Aldi Suisse for your last minute things in the week. Milk and bread aren't that much more.
I have to say though - Swiss meat is on another level of quality - incomparable with German or French.
If you don't want to do cross border shopping, well you will numb to it someday and you just have to buy as you usually would. You can't spend every day questioning the price of everything and not enjoying life. Take heart that the money is ensuring that Swiss workers are on a good salary supported by the prices.
You also have to remember the salaries most people are on in Switzerland are in line with the cost of living, and ex-pats usually earn more, when you add in a nice 8-10% tax rate you have more disposable income than you would in the UK.