The dizziness certainly could have been related to your blood pressure dropping too low. Changing your tablets times may have triggered this. As you are responsible for driving trains your doctor needs to be sure this is will not happen again before you can go back to work. There are many different causes of dizziness, both cardiac (heart) and neurological (brain) that would need to be considered. If you now feel completely well, there may be something else you could do at work that is not safety critical such as train driving (e.g office work) until the tests are completed. If you are desperate to get back to work sooner, talk to your GP and your employer to see if this could be an option for you.
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