Big Brother alum Jessica Nickson recently received life-changing news. “This weekend, I had my whole world flip upside down,” Jessica, 35, wrote via Instagram on Monday, August 3, over a video of herself in the driver’s seat of her car. “At 35, I’m just finding out that the man I called ‘Dad’ my whole life is not my biological father.” In the caption, the reality star explained, “It all started with an innocent 23andme test. Now, 3 DNA tests later, I find myself furious. You probably have a million questions. So do I. Not sure where to go from here.” Fans and friends expressed their support — and some even shared their own similar…