I'm really worried about my mom, she's 63 and has had asthma for a long while. Lately, she's been having trouble with her breathing and she's also been getting headaches. We went to the hospital and got an X-ray, ECG, and COVID test done, and thankfully, everything came back normal. But I'm still concerned and thinking of keeping her on oxygen at home for a bit because I'm afraid of the risks at the hospital. Can you tell me how to get an oxygen cylinder for home use and what precautions I should take?