first i think it is very unlikely that the health law will be repealed. even though republicans in the house of representatives want to repeal it the democratically controlled senate and president obama will never go for it. to be sure there may be changes. but a complete repeal is unlikely under the current political climate. however should the law be repealed down the road you may experience some changes to your coverage. given the fact that both political parties don't want people to lose coverage because of pre-existing health conditions i am sure that if repeal ever happened there would be protections in place to make sure people did not lose their coverage.
what happens if obamacare is repealed and i have to switch to another insurance company from my current one? . will they be able to cancel me? especially for people with pre-existing conditions.