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Is not easy to reply to your questions as it depends the way you've made the changes and from how many time you did them.
If you better explain I could be more accurate to help you.
Anyway,generally is not adviceable to make changes without the "bless" of a good SEO software,but the situation could be less difficult than you think.
I would wait a month or so,than without results I would review my job.
Kinda like the stock market: some days you lose money, but the big picture over a few months is what's important. You may see a dip, but there's no reason to panic and sell! :)