Fear and anxiety. These panic attacks?

I always have fear of being left alone. I always feel like that eveyone will leave me and i shall be left alone, be it friends, be it my family members, be it close people. Whenever i think about this, I get sudden goosebumps on chest, its a very bad shivering experience, fists clinch, breathing gets heavy, tears roll out, irrespective of the thing where i am be it office or home or anywhere. It lasts for 5-10 seconds. Feels like someone shud come and press my chest hard to give me some momentary relief. Are these panic attacks ? These are the worst things that have occured to me, in last 6 months. Sometimes these are so intense that i get series of these things say 5-6 times. It feels dreadful, feels very vulnerable. Dont know what to do to stop this. Dont Want to take any medicines for these.