@Flower4 -Unfortunately, it does seem likely that your acceptance will be rescinded. I can’t tell from your message if your GPA is now below 3.0 but that sounds very possible. If so, that alone is grounds for losing your spot. Then, on top of that, the typical UC conditional acceptance says “No grade below C.” So, even if your GPA is still okay, your D’s will be deal-breakers. You should definitely contact the admission office immediately and plead your case. I’m sure that the admission folks will consider your tough course load before making a final decision, but your drop in grades sounds significant to me and will most likely work against you.
BUT … even if you lose your spot at UCSD, it is not the end of the world. Many successful individuals achieved their success because they were forced to deal with serious set-backs as teenagers or young adults. Frankly, the people I worry about in the world aren’t those who have failed at something but those who have never failed and who thus never learn how to deal with disappointment.
There are still colleges accepting students for the fall (and some even have financial aid), and there are always community colleges, too. If your acceptance is rescinded, contact me again and I can suggest some colleges that will welcome you, even at this late date.