The third-seeded Briton needed medical attention just minutes into the contest before she felt well enough to continue.
"My heart rate shoots up for no reason, we didn't have a long point, I wasn't gassing in any way in my lungs," the World No 15 said. "It actually goes up and stays there so it makes me a bit lightheaded, I just needed to see the doctor and the physio. "It was very high when they came out. I was having all the checks. I am as fit as a fiddle but it can happen. It took a while to settle down but then it did and I was able to concentrate on the tennis.""We don't know why it happens, it's been under stressful situations, in no stress situations. We just don't know. It's been sporadic," Konta said.
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