Yes, in Switzerland there are many different dialects of the german language.
In fact when you move to different regions in Switzerland, you'll find an other dialect of german. Bern, Basel, St.Gallen, Zürich are all different.
Go to the middle of the reference page indicated hereafter, there you can listen live radiostations from Switzerland in different languages.
But you can find it easier on this page:
- In fact if you speek your german (german of Germany) - that is ok in swiss german areas, they call it "Hochdeutsch" (high german") and also when french speaking swiss people talk to them in german, the dialogue will be in Hochdeutsch (so, your german) unless the french speaker can talk to them in that particular dialect...
The written language is more in Hochdeutsch than in the local dialect. But, more and more there are publications and newspapers writing in the local dialect.
SO - I don't think you will lose your german, at least you learn some dialect also...
search for (go down to) this line: "Esperanto: Auskultu svisajn radiostaciojn en la 4 oficialaj lingvoj de Svislando:"