Final answer:
The symptoms mentioned suggest a range of medical conditions such as hyperthyroidism or Lyme disease, especially considering the individual's recent outdoor activities in an area known for ticks.
Step-by-step explanation:
The individual described in the question presents with symptoms of weight loss, profuse sweating, increased heart rate, and difficulty sleeping. Despite the mention of fibromyalgia symptoms, these specific signs could point toward a variety of medical conditions, such as hyperthyroidism, infections, or other systemic diseases. However, assessing Kayla, the 24-year-old engineer, her recent move to New Hampshire and her hobbies which include spending extensive time outdoors suggest the possibility of conditions like Lyme disease, especially given the region's prevalence of ticks. The combination of fever, headache, muscle aches, and fatigue, after time spent in the forest, aligns with the early symptoms of Lyme disease.