I have the mixed bag too!! Extremely underweight, fast pulse 120bpm, nervousness, anxiety, trembling, TED, "fast" bowels(Ugh!!) which i guess are more hyPER symptoms, but then the flip side; brain fog, forgetfulness, depression, sleepyness which i guess are hyPO. a very grim list. I have more symptoms of hyPER, but was diagnosed as hyPO...recently. Still a bit confused by the diagnosis though!!