I would suggest you take a look at this site before you panic: http://www.cholesterol-and-health.com/cholesterol-and-disease.html - it can get a little scientific and technical but this is your health; it's worth wading through a few $5 words for. Cholesterol is a LOT more complicated than just "high" or "low" cholesterol; the type matters, the ratios matter, the particle density matteres..."high vs. low" makes a good story for news headlines but it isn't that simple in the real world. Also, even though blood cholesterol content is probably significant for health, for the majority of people it's very debatable whether dietary cholesterol raises blood cholesterol, just like eating fat doesn't make you fat. Again, not as simplistic as the media like to have it.
As you point out, there's no way for you to know that W30 eating caused your high cholesterol, since you didn't have it tested beforehand. Also, I'd really suggest that you get it tested a few more times, since cholesterol can vary widely with things like pregnancy and menstruation, significant fat loss, etc. So just one test is useful but not definitive; maybe you could get two or three spread out over a few weeks to get a clearer idea.
Whatever you do, definitely do a lot more research before you panic. Everyone kind of thinks "cholesterol = DEATH" because that's what we hear from the media all the time, but it's not nearly that clear-cut. If you post your specific numbers, people would be able to give you much more useful help.