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It would be very unlikely that this is due to a brain tumor. With a normal MRI 2 years ago, it would be very unlikely that a brain tumor could have developed and grown to a point that it would cause headaches or any of the other throat and neck symptoms that you describe.
In medicine, we usually do not like to say "never", but the likelihood of development of a brain tumor causing these symptoms in the two years since a normal MRI is extremely low.
The headache that occurred with laughter was most likely due muscular in origin, in that same way that the muscles in the chest and stomach also hurt. It also is very possible that the clenching of teeth could be contributing to your symptoms.
If I can provide any additional information, please let me know.
Much less than 1% chance that these symptoms are due to a brain tumor.
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