Hi there. It is natural to feel worried about your pets- they are important members of your family and we are all very protective of them. However, if he is showing the symptoms you mentioned, then I think it is important that the doctor tries to find out what is wrong with him and how he/she can help him feel better. Some tests may require him to stay in the hospital for a day or even a few days but most hospitals will allow you to visit, as long as you arrange a time with them. Also, you can ask the doctor to explain to you why the tests are being done and this may put your mind at ease. Some hospitals will allow you to leave his favourite blanket or stuffed toy and this may help him feel more at home. Ozbeck is lucky to have such a caring owner and I hope it all works out ok!