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Possible causes may include Infection,Acute coronary syndrome.
Your blood pressure should be monitored.
Your current symptoms shouldn't be ignored and if possible see a doctor at ER ASAP.
Hydrate yourself with Oral rehydration solution.
Also take OTC Tylenol/Aspirin if you have.
Do gentle massage at back of neck.
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Your lightheadedness,blurred vision and fast heart rate indicate cardiac arrhythmia/acute coronary syndrome.
Swollen lymph nodes indicate infection.
So your blood pressure,pulse should be monitored.
Thyroid dysfunction should be ruled out as well.
In my opinion you should see a doctor at ER.
If you can monitor your blood pressure then let me know the values so I suggest you some self care measures.
Do you have stuffy nose,clogged ears,neck stiffness?
I would strongly advise you go to ER, as it seems you may have some form of cardiac arrhythmia. In fact it would be ideal to call an ambulance.