Help, I've lost weight

In a month, I've gone from 97kg to 90kg through a combination of high protein diet and rigourous HIIT and cardio.

However, yesterday, something freaky happened. When I keep my foot down normally, it feels like my brain gets catapulted up.

I hypothesize that this is cos my body isn't used to me being lighter this quick and I have neglected muscle training.

Is this correct and just a minor setback or should I be worried?

submitted by /u/Obsidian297
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source https://www.reddit.com/r/loseit/comments/rmsngd/help_ive_lost_weight/