Udo is frequently and suddenly overcome by intense fear, heart palpitations, dizziness, and difficulty breathing. udo is most likely suffering from

Panic disorder

Explanation:

Panic disorder (PD) is characterized by sudden and intense anxiety attacks with a strong sense of fear or discomfort, accompanied by physical symptoms. Seizures can occur anywhere, in context or at any time, lasting on average 15 to 30 minutes, where the person experiences heart palpitations, dizziness and difficulty breathing.

Panic attacks cause intense psychological distress with major behavioral changes due to fear of new attacks. This causes patients to seek medical emergencies for organic causes that explain their symptoms.

question - in 1827, john walker, a druggist in a small english town, tipped a splint with sulphur, chlorate of potash, and sulphid of antimony, and rubbed it on sandpaper, and it burst into flame. the druggist had discovered the first friction-chemical match, the kind we use to-day. it is called friction-chemical because it is made by mixing certain chemicals together and rubbing them. although walker's match did not require the bottle of acid, nevertheless it was not a good one. it could be lighted only by hard rubbing, and it sputtered and threw fire in all directions. in a few years, however, phosphorus was substituted on the tip for antimony, and the change worked wonders. the match could now be lighted with very little rubbing, and it was no longer necessary to have sandpaper upon which to rub it. it would ignite when rubbed on any dry surface, and there was no longer any sputtering. this was the phosphorus match, the match with which we are so familiar. according the paragraph what was the benefit of the new phosphorus match? it burst into flame when rubbed on sandpaper. it was made by mixing chemicals. it could be ignited on any dry surface. it threw fire in all directions.

answer - matches required natural chemicals

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