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I think it Best for you to play it safe and get checked today since you plan long long trip tomorrow ..
If ER they can check your blood pressure / pulse / follow up check as to CHF --- pulse oximetry reading / chest xray if needed / blood test for BNP ( helps to evaluate status of the work of the heart )
Electrolytes -- sodium / potassium / calcium / magnesium -- these could relate to you feeling dizzy ( low sodium can cause that ) low potassium could cause cramping
Medication adjustment may be needed ...
The ER may seem overkill but can give you quick results ...
I think it safer for this to be checked prior to your long trip
I hope that this is helpful for you
Let me know if you have further questions or concerns
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Thank you and Best Regards!