Hectic Manager

Hi all, I am currently working for 4 projects and my Manager calls me over phone multiple times and force me to sort issue asap by EOD. Though I am on sick leave he used to call me multiple times and speak in a very 3rd grade type and threatens me like if u dint do then I will see you in future.. can anyone suggest in proper official manner what to do with this cyco Manager? I have said multiple times to assign another associate and for backup but he says only u r resource and you have to do. I dint get if in leave also that fellow want work from me.. Please suggest how can I get relief from this maanger