Re: Dizziness, blood pressure fluctuations
If the onset of dizziness coincides with the timeframe you've been taking atenolol, then it could be a factor but you are on a very small dose, so the possibility is there but very small. It's important to separate dizziness as in the true sensation of feeling like the room is spinning around you or that you are tumbling off balance because you feel as though you are spinning or moving, from light-headedness which can make you feel wobbly and tend to make you lean forward or back. Transient vertigo that lasts for a second or two and occurs infrequently throughout the day can be due to anxiety and or stress.
As for worrying, you'll discover that it pays no dividends toward your health, either proactive or reactive, and you can have your life back at any point you choose by changing your perspectives on what warrants concern in life.
You'll be fine.
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Best regards and Good Health